package servlet;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import model.User;
import db.DB;

@SuppressWarnings("serial")
public class mainServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public mainServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	@SuppressWarnings("unchecked")
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//Set request and response encoding
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		//get inputed username and password
		String username=request.getParameter("username");
		String pwd=request.getParameter("pwd");
		DB db=new DB();
		HttpSession session=request.getSession();
		User user=(User)session.getAttribute("user");
		if(user==null){
			user=db.checkUser(username, pwd);
		}
		session.setAttribute("user", user);
		if(user!=null){
			ArrayList al=db.findMessage();
			session.setAttribute("al", al);
			response.sendRedirect("main.jsp");
		}else{
			response.sendRedirect("login.jsp");
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
